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论文类型：会议论文

发表时间：2014-11-15

收录刊物：EI、CPCI-S、Scopus

卷号：5

页面范围：260-263

关键字：pillar; failure model; pillar size; microcrack; stress concentration

摘要：Orebodies in shear often fail catastrophically. In this paper, the failure process of pillar in shear was studied numerically by the self-developed 2D Rock Failure Process Analysis code (abbreviated as RFPA(2D)). This work is focused on the appropriate pillar size for safe and economic extraction from orebodies under shear loading. Numerical simulation shows clearly that pillars of different angle and different width to height ratio under different confining pressure have different shear strength and show different failure model. With the increase of pillar angle, the junction of pillar and roof firstly appears stress concentration. It leads to the generation of micro cracks and makes pillar happen failure from surface to inner. Pillars in shear often fail due to reduced confinement and increased brittleness. This paper indicates that RFPA code is a viable tool for providing explanation for failure mechanisms of pillars and guidelines for shear stress consideration in pillar design for orebodies in shear.